Push... would probably have been better as a 13-episode TV series. A lot of its structural weaknesses would actually be strengths in a serial format (eg. we follow a couple of characters separately, then the plot brings them together and it turns out with zero foreshadowing that they know each other; a mysterious villain shows up to randomly threaten one of the protags, then... goes away... and comes back and does it some more without adding to the plot in any way). It's worth a watch -- the worldbuilding and the visuals are better than the script.

Alien 1 is a tidy little horror flick about a giant space insect with great form factor, though I suspect the "director's cut" is more boring than the original theatrical release. Alien 2 is James Cameron through and through: nobody can pace a 100% commercial masterpiece like that guy. You root for the heroine and boo the baddies. I haven't seen Alien 3 but the consensus among ppl I talk to is "it's not actually a bad movie, I don't know why ppl bitch about it so much!" I have also been promised Winona Ryder at some point.